Validation of 1D and 2D modelling assumptions to predict compact porous medium burners

机译：验证一维和二维建模假设以预测紧凑型多孔介质燃烧器

获取原文

页面导航

摘要
著录项
相似文献
相关主题

摘要

In this work we report one and two-dimensional numerical methodologies to predict conductive, convective and radiative heat transfer as well as premixed methane combustion inside a porous media burner. Both approaches consider thermal nonequilibrium between the gas and solid matrix by using separate energy equations for the gas and the solid phases and coupling them theough a convective heat transfer coefficient. The reaction was described by using multistep detailed chemical kinetics. The 1D and the 2D (axisymmetric) discrete ordinates method was applied to solve the radiative transfer equation and the porous medium was assumed to emit, absorb and isotropically scatter radiation. The numerical predictions (1D or 2D) were compared with experimental temperatures and with XO_x and CO concentrations obtained for a real combustor with an incorporated heat exchanger. The predictions show the important role of the non-equilibrium assumption since different solid and gas temperatures were predicted. In addition, the skeletal reaction mechanism combustion model yields good agreement with NO_x and CO emissions.

机译：在这项工作中，我们报告了一维和二维数值方法，以预测多孔介质燃烧器内的传导，对流和辐射热传递以及甲烷的预混合燃烧。两种方法都通过对气相和固相使用单独的能量方程，并通过对流传热系数进行耦合来考虑气相和固相之间的热不平衡。通过使用多步详细化学动力学描述了该反应。应用一维和二维（轴对称）离散纵坐标方法求解辐射传递方程，并假设多孔介质会发出，吸收并各向同性地散射辐射。将数值预测值（1D或2D）与实验温度以及带有内置热交换器的真实燃烧器的XO_x和CO浓度进行了比较。这些预测表明了非平衡假设的重要作用，因为预测了不同的固体和气体温度。此外，骨架反应机理燃烧模型与NO_x和CO排放量具有良好的一致性。

著录项

来源
《International heat transfer conference;IHTC1998》|1998年|p.471-477|共7页
会议地点
作者
Isabel B. Malico; Xiangyang Zhou; Jose C.F. Pereira;
展开▼
作者单位

展开▼
会议组织
原文格式 PDF
正文语种
中图分类能源与动力工程;
关键词

相似文献

外文文献
中文文献
专利

1. Validation of the local thermal equilibrium assumption in natural convection from a vertical plate embedded in porous medium: non-Darcian model [J] . O. M. Haddad, M. A. Al-Nimr, A. N. Al-Khateeb International Journal of Heat and Mass Transfer . 2004,第8a9期

机译：从多孔介质中嵌入的垂直板中自然对流中的局部热平衡假设的验证：非达西模型
2. 3-D NUMERICAL MODELING AND EXPERIMENTAL INVESTIGATION OF A PARTIAL PREMIX-TYPE POROUS MEDIUM BURNER USING LIQUEFIED PETROLEUM GAS FUEL [J] . R. M. N. Muhad, M. Z. Abdullah, A. A. Mohamad, Journal of porous media . 2010,第7期

机译：液化石油气对部分预混合型多孔介质燃烧器的3D数值建模和实验研究
3. Analysis of simplifying assumptions for the numerical modeling of the heat and mass transfer in a porous desiccant medium [J] . Ruivo CR, Costa JJ, Figueiredo AR Numerical Heat Transfer, Part A. Application: An International Journal of Computation and Methodology . 2006,第9期

机译：多孔干燥剂介质中传热和传质数值模型简化假设的分析
4. Validation of 1D and 2D modelling assumptions to predict compact porous medium burners [C] . Isabel B. Malico, Xiangyang Zhou, Jose C.F. Pereira International heat transfer conference . 1998

机译：验证1D和2D建模假设以预测紧凑型多孔介质燃烧器
5. Design of Porous Medium Burners by Means of Additive Manufacturing =Conception et optimisation de br?leurs poreux par fabrication additive [D] . Samoilenko, Mykhailo . 2018

机译：通过添加剂制造设计多孔介质燃烧器=添加剂制造的多孔Broc设计和优化
6. Predicting Confined 1D Cell Migration from Parameters Calibrated to a 2D Motor-Clutch Model [O] . Louis S. Prahl, Maria R. Stanslaski, Pablo Vargas, 2020

机译：从校准到2D电动离合器模型的参数预测限制1D细胞迁移
7. This article presents a new numerical model describing the behaviour of a thermally thick wood sample exposed to high solar heat flux (above 1 MW/m2). A preliminary study based on dimensionless numbers is used to classify the problem and support model building assumptions. Then, a model based on mass, momentum and energy balance equations is proposed. These equations are coupled with liquid-vapour drying model and pseudo species biomass degradation model. By comparing to a former experimental study, preliminary results have shown that these equations are not enough to accurately predict biomass behaviour under high solar heat flux. Indeed, a char layer acting as radiative shield forms on the sample exposed surface. In addition to this classical set of equations, it is mandatory to take into account radiation penetration into the medium. Furthermore, as biomass contains water, medium deformation consecutively to char steam gasification must also be implemented. Finally, with the addition of these two strategies, the model is able to properly capture the degradation of biomass when exposed to high radiative heat flux over a range of sample initial moisture content. Additional insights of biomass behaviour under high solar heat flux were also derived. Drying, pyrolysis and gasification fronts are present at the same time inside of the sample. The coexistence of these three thermochemical fronts leads to char gasification by the steam produced from drying of the sample, which it is the main phenomenon behind medium ablation. [O] . Pozzobon, Victor, Salvador, Sylvain, Bézian, Jean Jacques 2018

机译：本文提供了一个新的数值模型，该模型描述了暴露于高太阳热通量（高于1 / MW / m2）的热厚木材样品的行为。基于无量纲数的初步研究用于对问题进行分类并支持模型构建假设。然后，提出了一种基于质量，动量和能量平衡方程的模型。这些方程式与液体蒸汽干燥模型和假物种生物质降解模型耦合。通过与以前的实验研究进行比较，初步结果表明，这些方程不足以准确预测高太阳热通量下的生物量行为。的确，在样品暴露的表面上形成了充当辐射屏蔽层的炭层。除了这套经典的方程式之外，还必须考虑到辐射向介质的渗透。此外，由于生物质中含有水，因此还必须在炭蒸气汽化后进行连续的介质变形。最后，通过添加这两种策略，该模型能够在一定范围的样品初始水分含量下暴露于高辐射热通量的情况下，正确捕获生物质的降解。还得出了在高太阳热通量下生物量行为的其他见解。样品内部同时存在干燥，热解和气化前沿。这三个热化学前沿的共存会导致样品干燥产生的蒸汽产生焦炭气化，这是介质烧蚀的主要现象。

Validation of 1D and 2D modelling assumptions to predict compact porous medium burners

摘要

著录项

相似文献

相关主题

期刊订阅